The People You Trust, Trust ARG
The experts behind ARG are the leaders in our industry that others look to forguidance. Our Scientific Advisory Board and Medical Affairs Team bring years ofhands-on clinical practice, deep scientific knowledge, and recognized leadershipin integrative health—providing the insight and oversight that define ARG’sinnovation and uncompromising standards.
Scientific Advisory Board
-
Alex Rinehart
DC, MS, CNSRead MoreDr. Alex Rinehart is a board‑certified chiropractic physician and Certified Nutrition Specialist with a Master’s degree in Applied Clinical Nutrition. After earning his DC, he worked as the Director of Health Education for Med-Chem Labs in Goodyear, Arizona, and founded the AZ Nutrition Center in Scottsdale, Arizona.
Dr. Rinehart’s client-first philosophy centers on identifying and resolving root causes, such as stress, inflammation, gut imbalance, oxidative stress, and hormone dysfunction, through personalized lab analysis and tailored action plans. He dives deep with clients before crafting plans that may include whole food guidance, elimination diets, nutrigenetic insights, medical-grade supplements, and behavioral support.
An educator, consultant, and writer with over 15 years of experience in functional medicine, Dr. Rinehart is especially known for his work in gut health, immune support, and chronic inflammation. He’s been recognized as a “Microbiome Pioneer” and continues to empower patients with evidence-based strategies focused on fueling the microbiome to promote whole-body wellness. His blog and article library provide ongoing education, and he offers a curated online supplement shop featuring over 25,000 professional-grade products across 325+ brands. His ultimate mission is to “Fuel your biome,” helping individuals take proactive ownership of their health with personalized, functional, and holistic care.
-
Lara Zakaria
PharmD, MS, CDN, CNS, IFMCPRead MoreDr. Lara Zakaria is a Pharmacist and Nutritionist with a focus in implementing solutions for Functional Medicine and personalized nutrition. A graduate of the Ernest Mario School of Pharmacy, at Rutgers University (BSpharm) and the University of Colorado Skaggs College of Pharmacy (PharmD), she spent 20 years in community pharmacy practice. After developing an interest in nutrition, she earned a MS in Nutrition from the University of Bridgeport and subsequently qualified as a Certified Nutrition Specialist (CNS) as well as an Institute for Functional Medicine Certified Practitioner (IFMCP).
Dr Zakaria’s practice focuses on a multi-disciplinary approach working both one-on-one with patients as well as creating implementation tools and systems for scale. She is also faculty at the Integrative Medicine program at George Washington University, as well as guest instructor for Functional Medicine at LECOM College of Pharmacy. Lara is passionate about gut health and the prevention and reversal of metabolic, allergic, and autoimmune disease. There’s power in community, working with pharmacy professionals, nutritionists, and other clinicians to leverage their unique expertise to amplify the message of personalized nutrition and FxMed.
https://www.linkedin.com/in/lara-zakaria/
https://instagram.com/foodiefarmacist -
Richard Harris
MD, PharmD, MBARead MoreDr. Richard Harris is a board-certified internal medicine physician and pharmacist. Dr. Harris attended the University of Texas at Austin for pharmacy school, pursued medical education at the McGovern School of Medicine in Houston, and earned an MBA at the University of Houston.
Dr. Harris's client-centric view focuses on building relationships and trust through a comprehensive lifestyle medicine system. He is the chief strategy officer for Nimbus Healthcare and the chief medical officer for Script Health. Dr. Harris has been a guest speaker at several national conferences and has served on advisory boards with leading minds in medicine, supplements, and holistic wellness. He is an avid reader, weight lifter, and video game enthusiast in his spare time. Dr. Harris enjoys sports, traveling, philanthropy, and church.
https://linkedin.com/in/drharrismd
https://instagram.com/drharrismd
https://tiktok.com/@drharrismdpharmd
https://www.youtube.com/drrichardharrisMD -
Shawn Tasson
MD, PhDRead MoreDr. Shawn Tassone is a double board-certified OB/GYN and integrative medicine physician with a PhD in mind-body medicine. He earned his medical degree from Creighton University School of Medicine and completed his residency in obstetrics and gynecology at the University of Oklahoma Health Sciences Center. His doctoral studies explored the intersection of spirituality and health, shaping a unique approach that blends conventional medicine with integrative and holistic care.
Dr. Tassone has cared for over 50,000 women in his clinical career and is widely known as “America’s Holistic Gynecologist.” He is the creator of the SHINES protocol and the Integrative Hormonal Mapping System, which guide patients through personalized evaluations of spiritual, hormonal, and lifestyle factors contributing to their health. His clinical focus includes hormone balancing, menopause and perimenopause care, thyroid health, and bioidentical hormone therapy. He lives and practices in the Austin, Texas area, where he offers both in-person and telehealth visits.
In addition to his clinical work, Dr. Tassone is an author, speaker, and educator. His book The Hormone Balance Bible presents 12 hormonal archetypes and has become a popular resource for patients and practitioners alike. He hosts the podcast Confessions of a Male Gynecologist and has been featured in The New York Times, NBC News Online, and Stanford MedX.
Medical Affairs Team
-
Corey Schuler
FNP, PhD, CNS, MBARead MoreDr. Corey Schuler is a board-certified family nurse practitioner and Certified Nutrition Specialist with over 15 years of clinical, academic, and leadership in integrative and functional medicine. He holds a PhD in Health Sciences, an executive MBA in healthcare strategy, and certifications in holistic nutrition, botanical medicine, coaching and mindfulness.
Dr. Schuler has served in medical affairs and product innovation roles across leading dietary supplement and nutraceutical companies, with a specialization in evidence-based ingredient strategy, protocol development, and clinician education. He maintains clinical practice with a focus on primary care neuroendocrine and cardiometabolic health.
https://www.linkedin.com/in/cbschuler/ -
Allison Sayre
MSN, WHNPRead MoreAllison Sayre is a board-certified women’s health nurse practitioner with advanced expertise in hormonal health, integrative gynecology, and patient-centered care across the lifespan. She holds a Master of Science in Nursing and has served as both a clinical provider and educator in functional and conventional women’s health settings.
Allison has led clinical programming, practitioner training, and content development for leading health brands and organizations. Her work bridges the clinical and commercial worlds, helping translate scientific evidence into practical tools for healthcare practitioners. At ARG, Allison contributes to medical education, clinical protocol development, and strategic content that supports the evolving needs of women's healthcare practitioners.
-
Ashlyn Zikmund
NDRead MoreDr. Ashlyn Zikmund is a licensed naturopathic physician with a focus on therapeutic strategy, clinical integration, and root-cause care. With extensive experience in both private practice and multidisciplinary healthcare teams, she specializes in complex chronic conditions, including endocrine and metabolic disorders.
A trusted educator and clinical consultant, Dr. Zikmund brings a whole-person approach to medical affairs and practitioner engagement. Her background combines systems-based clinical thinking with practical application of botanical medicine, nutrition, and lifestyle therapeutics. At ARG, she contributes to practitioner education to ensure clinical relevance and alignment with integrative medicine principles.
https://www.linkedin.com/in/ashlyn-zikmund-20650847/ -
Kim Hapke
NDRead MoreDr. Kim Hapke is a licensed naturopathic physician with a focus on integrative medicine, root-cause investigation, and whole-person care. She brings over a decade of clinical experience supporting patients with complex, chronic conditions, with particular emphasis on stress physiology and mental health.
In addition to her clinical practice, Dr. Hapke has served as a trusted consultant to functional medicine organizations and health brands, helping translate scientific evidence into accessible, patient-centered strategies. She is known for her ability to blend deep clinical insight with practical, therapeutic frameworks. At ARG, Dr. Hapke contributes to product innovation and practitioner education.
-
Kristen McCormack
NDRead MoreDr. Kristen McCormack is a licensed naturopathic physician with a passion for practitioner education, evidence-informed therapeutics, and personalized medicine. She brings extensive experience in both clinical practice and the natural products industry, with expertise spanning functional endocrinology, nutritional biochemistry, and integrative product development.
Dr. McCormack has worked closely with healthcare professionals across disciplines to translate complex clinical concepts into actionable strategies. Her work bridges the gap between research, formulation, and frontline clinical use. At ARG, Dr. McCormack supports product development and practitioner training that empower clinicians to deliver individualized, effective care.
-
Laura Lewis
MSRead MoreLaura Lewis is a clinical researcher and science communicator with a Master of Science degree and a background in nutrition science and integrative health. She brings a decade of experience translating complex clinical data into accessible insights for healthcare practitioners and patients alike.
Laura has contributed to educational programming and strategic content development across the integrative and functional medicine space. Her strengths lie in evidence synthesis, practitioner engagement, and crafting communications that bridge the gap between scientific rigor and real-world application. At ARG, Laura supports clinical content development and educational initiatives that elevate practitioner confidence and product credibility.
-
Yvonne Hart
MS, NBC-HWC, CNSRead MoreYvonne Hart is a board-certified health and wellness coach and Certified Nutrition Specialist with a focus on the art and science of behavior change. With a background in biology and advanced training in integrative health coaching from Duke Integrative Medicine, she brings deep expertise in guiding therapeutic encounters that foster sustainable transformation.
Yvonne earned her Master of Science in Clinical Nutrition from Sonoran University of Health Sciences and has over a decade of experience helping individuals and healthcare practitioners apply lifestyle medicine principles in real-world settings. At ARG, she advises on behavior-focused clinical content, coaching-informed strategies, and practitioner-patient communication tools that enhance outcomes through empowered engagement.
